A Solved problem 4-6-P-ult with block shear. It is required to check the adequacy of a given C channel bolted to a plate against a given ultimate load.
The three-moment equations for steel continuous beams to estimate the moment values at the different support joints A, B, C, D -solved problem 10-1 2-3
The post includes the steps needed to get the area and Cg for a Parallelogram. This is done by getting the first moments of areas about two external axes.